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Allentown, PA Weather by Month and Climate Averages
Monthly normals · Rain · Snow
Sunshine · Freeze dates · Records · Best time to visit
What is the weather like in Allentown, PA?
Allentown, PA gets 47.4 in of precipitation a year over about 129 rainy days, and about 33.1 in of snow a season. July is the warmest month (average high 85°F) and January the coldest (average low 21°F).
Humid continental climate
Allentown, PA has hot summers and chilly winters. Daytime highs range from about 38°F in January to 85°F in July. July is usually the wettest month, and snow falls in winter. The most comfortable time to visit is typically April to May and September to October, when daytime highs sit near 69°F.
| Season | Months | Avg low | Avg high |
|---|---|---|---|
| Winter | Dec–Feb | 23° | 40° |
| Spring | Mar–May | 40° | 62° |
| Summer | Jun–Aug | 62° | 83° |
| Autumn | Sep–Nov | 44° | 65° |
How much rain does Allentown get?
Allentown gets 47.4 in of precipitation in an average year, spread over about 129 days with measurable rain. That is more rainy days than 85% of the US.
July is the wettest month, with 5.3 in. February is the driest, with 2.8 in. May has the most rainy days, about 12.
The longest dry spell in the last five years lasted 22 days, to June 11, 2023.
From September 2025 to August 2026 Allentown got 38.3 in of rain, against a normal of 47.4 in for those months. March 2026 had the most, with 6.1 in.
See where Allentown ranks: rainiest cities in the US, US cities with the most rainy days, rainiest cities in Pennsylvania.
Does it snow in Allentown?
Yes. Allentown gets about 33.1 in of snow in an average season, measured at the reporting station.
The snowiest winter on record is 1993–94, with 75.4 in.
The most recent measurable snow at the station fell on February 23, 2026.
From September 2025 to August 2026 the station measured 35.5 in of snow, against a normal of 33.1 in for those months. January 2026 had the most, with 20.8 in.
See where Allentown ranks: snowiest cities in the US.
Allentown weather by month
Allentown weather in January
In January, Allentown averages a high of 38°F and a low of 21°F. It gets 3.3 in of precipitation over about 11 rainy days. Estimated sunshine is 36% of daylight hours, derived from ERA5 cloud cover. The January record high is 70°F (2007) and the record low is -15°F (1994).
Allentown weather in February
In February, Allentown averages a high of 41°F and a low of 23°F. It gets 2.8 in of precipitation over about 10 rainy days. Estimated sunshine is 40% of daylight hours, derived from ERA5 cloud cover. The February record high is 81°F (2018) and the record low is -8°F (1996).
Allentown weather in March
In March, Allentown averages a high of 50°F and a low of 30°F. It gets 3.6 in of precipitation over about 11 rainy days. Estimated sunshine is 42% of daylight hours, derived from ERA5 cloud cover. The March record high is 87°F (1998) and the record low is 0°F (2015).
Allentown weather in April
In April, Allentown averages a high of 63°F and a low of 40°F. It gets 3.7 in of precipitation over about 12 rainy days. Estimated sunshine is 39% of daylight hours, derived from ERA5 cloud cover. The April record high is 93°F (1976) and the record low is 16°F (1982). April is one of the most comfortable months to visit.
Allentown weather in May
In May, Allentown averages a high of 72°F and a low of 50°F. It gets 3.6 in of precipitation over about 12 rainy days. Estimated sunshine is 38% of daylight hours, derived from ERA5 cloud cover. The May record high is 94°F (2026) and the record low is 29°F (1996). May is one of the most comfortable months to visit.
Allentown weather in June
In June, Allentown averages a high of 81°F and a low of 59°F. It gets 4.4 in of precipitation over about 11 rainy days. Estimated sunshine is 43% of daylight hours, derived from ERA5 cloud cover. The June record high is 98°F (2024) and the record low is 39°F (1972).
Allentown weather in July
In July, Allentown averages a high of 85°F and a low of 64°F. It gets 5.3 in of precipitation over about 11 rainy days. Estimated sunshine is 43% of daylight hours, derived from ERA5 cloud cover. The July record high is 104°F (2011) and the record low is 46°F (2001).
Allentown weather in August
In August, Allentown averages a high of 83°F and a low of 62°F. It gets 4.6 in of precipitation over about 10 rainy days. Estimated sunshine is 43% of daylight hours, derived from ERA5 cloud cover. The August record high is 99°F (2002) and the record low is 41°F (1986).
Allentown weather in September
In September, Allentown averages a high of 76°F and a low of 55°F. It gets 4.8 in of precipitation over about 10 rainy days. Estimated sunshine is 47% of daylight hours, derived from ERA5 cloud cover. The September record high is 99°F (1980) and the record low is 32°F (1974). September is one of the most comfortable months to visit.
Allentown weather in October
In October, Allentown averages a high of 65°F and a low of 43°F. It gets 4.1 in of precipitation over about 10 rainy days. Estimated sunshine is 49% of daylight hours, derived from ERA5 cloud cover. The October record high is 93°F (2019) and the record low is 21°F (1988). October is one of the most comfortable months to visit.
Allentown weather in November
In November, Allentown averages a high of 53°F and a low of 33°F. It gets 3.2 in of precipitation over about 9 rainy days. Estimated sunshine is 54% of daylight hours, derived from ERA5 cloud cover. The November record high is 79°F (1982) and the record low is 11°F (2018).
Allentown weather in December
In December, Allentown averages a high of 42°F and a low of 26°F. It gets 3.9 in of precipitation over about 12 rainy days. Estimated sunshine is 39% of daylight hours, derived from ERA5 cloud cover. The December record high is 72°F (2006) and the record low is -5°F (1989).
Sunshine, humidity and wind in Allentown
November is the sunniest month in Allentown, with estimated sunshine of 54% of daylight hours from ERA5 cloud cover. January is the cloudiest, at 36%. The annual cloud-cover estimate is 43% of daylight hours; it is not a measurement of sunshine duration. Allentown is cloudier than 76% of the US.
Humidity peaks in September at 69% and is lowest in March at 56%.
Wind averages 7 mph over the year, and March is the windiest month at 9 mph.
Allentown has about 17 days a year above 90°F. Allentown is cooler than 66% of the US.
Thunderstorms occur on about 25 days a year.
See where Allentown ranks: sunniest cities in the US, cloudiest cities in the US, hottest cities in the US.
First and last freeze in Allentown
The first fall freeze in Allentown typically comes around October 19, and the last spring freeze around April 22. That leaves a frost-free growing season of about 180 days.
Allentown weather records
These records cover ALLENTOWN LEHIGH VLY INTL AP during 1970–2026. Earlier records or other stations in the city may differ.
The hottest temperature on record at the Allentown station is 104°F, on July 22, 2011. The coldest is -15°F, on January 21, 1994.
The wettest day in the available station history brought 8.7 in of precipitation, on October 8, 2005.
46 all-time records have been set at the station since 1970.
The annual mean temperature has changed by +0.4°F per decade since 1970.
The best time to visit Allentown
The most comfortable time to visit is typically April to May and September to October, when daytime highs sit near 69°F.
Winter (December–February) is chilly, with average highs around 40°F and lows near 23°F. Snow is possible.
Spring (March–May) is mild, with average highs around 62°F and lows near 40°F.
Summer (June–August) is hot, with average highs around 83°F and lows near 62°F.
Autumn (September–November) is mild, with average highs around 65°F and lows near 44°F.
Monthly climate
| Month | Average low | Average high | Precip | Rain days | Wind | Humidity | Estimated sunshine | Record high | Record low |
|---|---|---|---|---|---|---|---|---|---|
| January | 21° | 38° | 3.3 in | 11 | 8 mph | 64% | 36% | 70° | -15° |
| February | 23° | 41° | 2.8 in | 10 | 8 mph | 61% | 40% | 81° | -8° |
| March | 30° | 50° | 3.6 in | 11 | 9 mph | 56% | 42% | 87° | 0° |
| April | 40° | 63° | 3.7 in | 12 | 9 mph | 56% | 39% | 93° | 16° |
| May | 50° | 72° | 3.6 in | 12 | 7 mph | 59% | 38% | 94° | 29° |
| June | 59° | 81° | 4.4 in | 11 | 7 mph | 60% | 43% | 98° | 39° |
| July | 64° | 85° | 5.3 in | 11 | 6 mph | 65% | 43% | 104° | 46° |
| August | 62° | 83° | 4.6 in | 10 | 5 mph | 68% | 43% | 99° | 41° |
| September | 55° | 76° | 4.8 in | 10 | 6 mph | 69% | 47% | 99° | 32° |
| October | 43° | 65° | 4.1 in | 10 | 7 mph | 68% | 49% | 93° | 21° |
| November | 33° | 53° | 3.2 in | 9 | 7 mph | 62% | 54% | 79° | 11° |
| December | 26° | 42° | 3.9 in | 12 | 7 mph | 66% | 39% | 72° | -5° |
Station: ALLENTOWN LEHIGH VLY INTL AP, 6 km from the city. Temperature normal baseline: 1991–2020, calculated from available NOAA GHCN-Daily observations. Available station history: 1970–2026; record values refer to this station and period, not the entire city’s history. Precipitation includes rain and the water equivalent of frozen precipitation; snowfall depth is shown separately when available. Sources and methods
From ERA5 reanalysis. Sunshine is estimated from cloud cover.
Allentown climate questions
How much rain does Allentown get?
Allentown gets 47.4 in of precipitation in an average year, over about 129 rainy days.
What is the wettest month in Allentown?
July is the wettest month in Allentown, with 5.3 in. February is the driest, with 2.8 in.
How many rainy days does Allentown have a year?
Allentown has about 129 days with measurable rain in an average year. May has the most, about 12.
Does it snow in Allentown?
Yes. Allentown gets about 33.1 in of snow in an average season. The snowiest winter on record is 1993–94, with 75.4 in.
What is the hottest month in Allentown?
July is the warmest month in Allentown, with an average high of 85°F.
What is the coldest month in Allentown?
January is the coldest month in Allentown, with an average low of 21°F.
What is the record high temperature in Allentown?
Within the available 1970–2026 station history, the record high at the Allentown station is 104°F, set on July 22, 2011. The record low is -15°F, on January 21, 1994.
What is the sunniest month in Allentown?
November is the sunniest month in Allentown, with estimated sunshine of 54% of daylight hours from ERA5 cloud cover. January is the cloudiest.
When is the first frost in Allentown?
The first fall freeze in Allentown typically comes around October 19. The last spring freeze is around April 22.
What is the best time to visit Allentown?
The most comfortable time to visit is typically April to May and September to October, when daytime highs sit near 69°F.